Journal ArticleDOI
High cycle fatigue mechanisms in a cast AM60B magnesium alloy
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In this article, the authors examined micromechanisms of fatigue crack initiation and growth in a cast AM60B magnesium alloy by relating dendrite cell size and porosity under different strain amplitudes in high cycle fatigue conditions.Abstract:
We examine micromechanisms of fatigue crack initiation and growth in a cast AM60B magnesium alloy by relating dendrite cell size and porosity under different strain amplitudes in high cycle fatigue conditions. Fatigue cracks formed at casting pores within the specimen and near the surface, depending on the relative pore sizes. When the pore that initiated the fatigue crack decreased from approximately 110 μm to 80 μm, the fatigue life increased two times. After initiation, the fatigue cracks grew through two distinct stages before final overload specimen failure. At low maximum crack tip driving forces (K max 2.3 MPam), the fatigue crack propagated primarily through the β-Al 12 Mg 17 particle laden interdendritic regions. Based on these observations, any proposed mechanism-based fatigue model for cast Mg alloys must incorporate the change in growth mechanisms for different applied maximum stress intensity factors, in addition to the effect of pore size on the propensity to form a fatigue crack.read more
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Corrosion fatigue behaviors of two biomedical Mg alloys - AZ91D and WE43 - In simulated body fluid.
TL;DR: The corrosion rate of the two experimental alloys increased under cyclic loading compared to that in the static immersion test, and the fatigue cracks initiated from the micropores when tested in air and from corrosion pits when testing in SBF.
Book ChapterDOI
Multiscale Modeling: A Review
TL;DR: A review of multiscale modeling for structural components can be found in this article, where the authors provide a brief history of various multi-scale methodologies related to solid materials and the associated experimental influences.
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Strain controlled cyclic deformation behavior of an extruded magnesium alloy
X.Z. Lin,Daolun Chen +1 more
TL;DR: In this paper, the fatigue properties of an extruded AZ31B magnesium alloy were evaluated using strain-controlled push-pull cyclic tests at different total strain amplitudes at room temperature.
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High cycle fatigue of a die cast AZ91E-T4 magnesium alloy
TL;DR: In this paper, the micro-mechanisms of fatigue crack nucleation and growth in a commercial high-pressure die cast automotive AZ91E-T4 Mg component were revealed.
Journal ArticleDOI
Corrosion fatigue fracture of magnesium alloys in bioimplant applications: A review
TL;DR: A review of the available literature on CF of Mg alloys in corrosive environments including simulated-body-fluid (SBF) and the associated fracture mechanism is presented in this paper.
References
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Journal ArticleDOI
A Continuum Model for Void Nucleation by Inclusion Debonding
TL;DR: In this paper, a boundary value problem simulating a periodic array of rigid spherical inclusions in an isotropically hardening elastic-viscoplastic matrix is analyzed and the effect of the triaxiality of the imposed stress state on nucleation is studied and the numerical results are related to the description of void nucleation within a phenomenological constitutive framework.
A continuum model for void nucleation by inclusion debonding
TL;DR: In this article, a boundary value problem simulating a periodic array of rigid spherical inclusions in an isotropically hardening elastic-viscoplastic matrix is analyzed and the effect of the triaxiality of the imposed stress state on nucleation is studied and the numerical results are related to the description of void nucleation within a phenomenological constitutive framework.
Journal ArticleDOI
Cast magnesium alloys for elevated temperature applications
Alan A. Luo,M. O. Pekguleryuz +1 more
TL;DR: In this paper, the alloy development, microstructure, properties and uses of cast magnesium alloys for elevated temperature applications are reviewed, and the alloying principles and strengthening mechanisms of magnesium are discussed to identify the potential alloy systems for automotive and aerospace industries.
Journal ArticleDOI
Casting defects and the fatigue behaviour of an aluminium casting alloy
TL;DR: In this article, a fracture mechanics analysis for the growth of fatigue cracks from the pores of an aluminium casting alloy is described, and it is shown that the fatigue life can be quantitatively predicted from a knowledge of the size of casting defects: in particular it explains the lack of effect of heat-treatment and the apparent absence of a mean stress effect.
Journal ArticleDOI
The science, technology, and applications of magnesium
TL;DR: The very low density and excellent castability of magnesium is leading to increased use in various applications, especially in automobiles, despite poor galvanic corrosion resistance and a higher cost than aluminum.